var now = new Date(); // 当前日期
var nowDayOfWeek = now.getDay(); // 今天本周的第几天
var nowDay = now.getDate(); // 当前日
var nowMonth = now.getMonth(); // 当前月
var nowYear = now.getYear(); // 当前年
nowYear += (nowYear < 2000) ? 1900 : 0;

var DateUtil = {
    /**
     * 获得当前日期
     *
     * @returns
     */
    getNowDay() {
        return this.formatDate(new Date());
    },
    /**
     * 获得本周的开始时间
     *
     * @returns
     */
    getStartDayOfWeek() {
        var day = nowDayOfWeek || 7;
        return this.formatDate(new Date(now.getFullYear(), nowMonth, nowDay + 1 - day));
    },
    /**
     * 获得本周的结束时间
     *
     * @returns
     */
    getEndDayOfWeek() {
        var day = nowDayOfWeek || 7;
        return this.formatDate(new Date(now.getFullYear(), nowMonth, nowDay + 7 - day));
    },
    /**
     * 获得本月的开始时间
     *
     * @returns
     */
    getStartDayOfMonth() {
        var monthStartDate = new Date(nowYear, nowMonth, 1);
        return this.formatDate(monthStartDate);
    },
    /**
     * 获得本月的结束时间
     *
     * @returns
     */
    getEndDayOfMonth() {
        var monthEndDate = new Date(nowYear, nowMonth, this.getMonthDays());
        return this.formatDate(monthEndDate);
    },
    /**
     * 获得某月/本月天数
     *
     * @returns
     */
    getMonthDays(myMonth) {
        let useMonth = myMonth || nowMonth
        var monthStartDate = new Date(nowYear, useMonth, 1);
        var monthEndDate = new Date(nowYear, useMonth + 1, 1);
        var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
        return days;
    },
    /**
     * 获得本季度的开始月份
     *
     * @returns
     */
    getQuarterStartMonth() {
        var quarterStartMonth = 0;
        if (nowMonth < 3) {
            quarterStartMonth = 0;
        }
        if (2 < nowMonth && nowMonth < 6) {
            quarterStartMonth = 3;
        }
        if (5 < nowMonth && nowMonth < 9) {
            quarterStartMonth = 6;
        }
        if (nowMonth > 8) {
            quarterStartMonth = 9;
        }
        return quarterStartMonth;
    },
    /**
     * 获得本季度的开始日期
     *
     * @returns
     */
    getQuarterStartDate() {
        var quarterStartDate = new Date(nowYear, this.getQuarterStartMonth(), 1);
        return this.formatDate(quarterStartDate);
    },
    /**
     * 获得本季度的结束日期
     *
     * @returns
     */
    getQuarterEndDate() {
        var quarterEndMonth = this.getQuarterStartMonth() + 2;
        var quarterStartDate = new Date(nowYear, quarterEndMonth, this.getMonthDays(quarterEndMonth));
        return this.formatDate(quarterStartDate);
    },
    /***
     * 得到本年的起止日期
     *
     */
    getCurrentYear() {
        //起止日期数组 
        var startStop = new Array();
        //获取当前时间 
        var currentDate = now;
        //获得当前年份4位年 
        var currentYear = currentDate.getFullYear();

        //本年第一天 
        var currentYearFirstDate = new Date(currentYear, 0, 1);
        //本年最后一天 
        var currentYearLastDate = new Date(currentYear, 11, 31);
        //添加至数组 
        startStop.push(currentYearFirstDate.format("yyyy-MM-dd"));
        startStop.push(currentYearLastDate.format("yyyy-MM-dd"));
        //返回 
        return startStop;
    },

    /**
     * @param 日期格式化
     * @returns {String}
     */
    formatDate(parmas) {
        var date = new Date(parmas)
        var myyear = date.getFullYear();
        var mymonth = date.getMonth() + 1;
        var myweekday = date.getDate();

        if (mymonth < 10) {
            mymonth = "0" + mymonth;
        }
        if (myweekday < 10) {
            myweekday = "0" + myweekday;
        }
        return (myyear + "-" + mymonth + "-" + myweekday);
    }
};

export default {
    DateUtil
}